CMSIS2000  0.0.7
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system_ARMCM3.c
См. документацию.
1 /**************************************************************************//**
2  * @file system_ARMCM3.c
3  * @brief CMSIS Device System Source File for
4  * ARMCM3 Device Series
5  * @version V1.07
6  * @date 30. January 2012
7  *
8  * @note
9  * Copyright (C) 2012 ARM Limited. All rights reserved.
10  *
11  * @par
12  * ARM Limited (ARM) is supplying this software for use with Cortex-M
13  * processor based microcontrollers. This file can be freely distributed
14  * within development tools that are supporting such ARM based processors.
15  *
16  * @par
17  * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
18  * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
20  * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
21  * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
22  *
23  ******************************************************************************/
24 
25 #include "ARMCM3.h"
26 
27 /*----------------------------------------------------------------------------
28  Define clocks
29  *----------------------------------------------------------------------------*/
30 #define __HSI ( 8000000UL)
31 #define __XTAL ( 5000000UL) /* Oscillator frequency */
32 
33 #define __SYSTEM_CLOCK (5*__XTAL)
34 
35 
36 /*----------------------------------------------------------------------------
37  Clock Variable definitions
38  *----------------------------------------------------------------------------*/
39 uint32_t SystemCoreClock = __SYSTEM_CLOCK;/*!< System Clock Frequency (Core Clock)*/
40 
41 
42 /*----------------------------------------------------------------------------
43  Clock functions
44  *----------------------------------------------------------------------------*/
45 void SystemCoreClockUpdate (void) /* Get Core Clock Frequency */
46 {
47 
48  SystemCoreClock = __SYSTEM_CLOCK;
49 
50 }
51 
52 /**
53  * Initialize the system
54  *
55  * @param none
56  * @return none
57  *
58  * @brief Setup the microcontroller system.
59  * Initialize the System.
60  */
61 void SystemInit (void)
62 {
63 
64  SystemCoreClock = __SYSTEM_CLOCK;
65 
66 }